Pink Water (not an algea)

[waterbear]

pink/violet water is often caused by manganese. Try a metal sequesterant and if the water turns back to normal you have your answer (since most pool stores don't test for manganse). Even if you don't need it a dose of metal seqesterant in the water won't hurt anything.

Edit: The fact that the color appeared when you ran the water over the chlorine leads me to believe strongly that this is the problem since chlorine oxidized the metal ions in the water and causes them to bec0ome colored.

[waterbear]

I would get some chlorine in their as it fills since you said the water is starting to turn green. That would most likely be from algae!